The cheapest and fastest coaches from Cardiff to London
Cheapest price
24S$
Average price
58S$
Fastest journey
3 h 10 m
Average duration
3 h 15 m
Buses per day
85
Distance
211 km
The best way to find a cheap coach ticket from Cardiff to London is to book your journey as far in advance as possible and to avoid travelling at rush hour.
The average ticket from Cardiff to London will cost around 58S$ if you buy it on the day, but you can find cheap coach tickets today for only 24S$.
Of the 85 buses that leave Cardiff for London every day 72 travel direct so it’s quite easy to avoid journeys where you’ll have to change along the way.
These direct buses cover the 211 km distance in an average of 3 h 15 m but if you time it right, some buses will get you there in just 3 h 10 m .
The slowest buses will take 3 h 20 m and usually involve a change or two along the way, but you might be able to save a few pennies if you’re on a budget.
NX216 · NX04010:15 PM8h05Cardiff, University6:20 AMLondon, Victoria Coach Station24 S$1One-way1 change
FlixBus1:40 AM4h00Cardiff, North Road (Friary Gardens)5:40 AMLondon, Victoria Coach Station32 S$1One-way0 changes
FlixBus1:40 AM3h40Cardiff, North Road (Friary Gardens)5:20 AMLondon, Hammersmith Broadway (Irish Cultural Centre)32 S$1One-way0 changes
FlixBus6:40 PM4h00Cardiff, North Road (Friary Gardens)10:40 PMLondon, Victoria Coach Station34 S$1One-way0 changes
FlixBus5:00 AM3h10Cardiff, North Road (Friary Gardens)8:10 AMLondon, Hammersmith Broadway (Irish Cultural Centre)38 S$1One-way0 changes
FlixBus5:00 AM3h10Cardiff, North Road (Friary Gardens)8:10 AMLondon, Hammersmith Broadway (Irish Cultural Centre)38 S$1One-way0 changes
NX5097:45 PM3h15Cardiff, Sophia Gardens11:00 PMLondon, Earl's Court45 S$1One-way0 changes
NX50911:30 AM3h15Cardiff, Sophia Gardens2:45 PMLondon, Earl's Court74 S$1One-way0 changes
NX5076:45 PM3h15Cardiff, Sophia Gardens10:00 PMLondon, Earl's Court55 S$1One-way0 changes
FlixBus5:25 PM3h20Cardiff, North Road (Friary Gardens)8:45 PMLondon, Hammersmith Broadway (Irish Cultural Centre)40 S$1One-way0 changes
Travel Information
Compare train and coach for Cardiff to London
Omio recommends booking the coach as it is the most popular option from Cardiff to London among Omio's users. If you are prioritising price take the coach with prices starting from 9S$. For those with little time consider booking a train which can get you there in 3h 10m. In case you are seeking to minimise your carbon footprint the train is your best bet as it emits only 0.1 - 0.2kg. The ticket price range depends on the travel mode: a coach costs an average of 9S$, and a train costs an average of 60S$.
Distance: 211 km
Compare bus with
Most popular Coach | Train |
|---|---|
25S$ Average Price Cheapest | 105S$ Average Price |
3h 53m Average total duration 3h 23m Onboard + 30m Additional time* | 3h 40m Average total duration Fastest 3h 10m Onboard + 30m Additional time* |
0.2 - 0.5kg CO2 emissions | 0.1 - 0.2kg CO2 emissions Lowest |
![]() Most popular bus company | ![]() Most popular train company |
Direct Options | Direct Options |
Additional time: Average total travel duration to departure point, security checks and transfers.
Live departures
Cardiff to London bus times
The table below shows live departures for Cardiff to London coaches for today, Thursday, 13 August. You can also manually refresh the results below to see updated coach journeys.
| Provider | Departs | Duration | Arrives | Changes | Tickets |
|---|---|---|---|---|---|
NX509 | 7:15 PM Cardiff, Sophia Gardens | 3h30 | 10:45 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 7:15 PM Cardiff, Sophia Gardens | 3h15 | 10:30 PM London, Earl's Court | 0 changesdirect | |
NX509 | 7:23 PM Cardiff, University | 3h22 | 10:45 PM London, Victoria Coach Station | 0 changesdirect | |
NX216 · NX040 | 10:15 PM Cardiff, University | 8h05 | 6:20 AM London, Victoria Coach Station | 1 change | |
NX201 · NX035 | 11:40 PM Cardiff, Sophia Gardens | 5h10 | 4:50 AM London, Victoria Coach Station | 1 change | |
NX201 · NX032 | 11:40 PM Cardiff, Sophia Gardens | 4h50 | 4:30 AM London, Earl's Court | 1 change | |
| Friday, 14 August | |||||
FlixBus | 1:40 AM Cardiff, North Road (Friary Gardens) | 4h00 | 5:40 AM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 1:40 AM Cardiff, North Road (Friary Gardens) | 3h40 | 5:20 AM London, Hammersmith Broadway (Irish Cultural Centre) | 0 changesdirect | |
NX201 · NX444 | 1:40 AM Cardiff, Sophia Gardens | 4h10 | 5:50 AM London, Victoria Coach Station | 1 change | |
NX201 · NX030 | 1:40 AM Cardiff, Sophia Gardens | 4h10 | 5:50 AM London, Victoria Coach Station | 1 change | |
NX201 · NX030 | 1:40 AM Cardiff, Sophia Gardens | 3h50 | 5:30 AM London, Earl's Court | 1 change | |
NX201 · NX444 | 1:40 AM Cardiff, Sophia Gardens | 3h50 | 5:30 AM London, Earl's Court | 1 change | |
NX509 | 3:15 AM Cardiff, Sophia Gardens | 3h35 | 6:50 AM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 3:15 AM Cardiff, Sophia Gardens | 3h20 | 6:35 AM London, Earl's Court | 0 changesdirect | |
NX509 | 3:20 AM Cardiff, University | 3h30 | 6:50 AM London, Victoria Coach Station | 0 changesdirect | |
NX201 · NX025 | 3:25 AM Cardiff, Sophia Gardens | 4h45 | 8:10 AM London, Victoria Coach Station | 1 change | |
NX201 · NX025 | 3:25 AM Cardiff, Sophia Gardens | 4h15 | 7:40 AM London, Earl's Court | 1 change | |
NX509 | 4:20 AM Cardiff, Sophia Gardens | 4h00 | 8:20 AM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 4:20 AM Cardiff, Sophia Gardens | 3h35 | 7:55 AM London, Earl's Court | 0 changesdirect | |
NX509 | 4:25 AM Cardiff, University | 3h55 | 8:20 AM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 5:00 AM Cardiff, North Road (Friary Gardens) | 3h10 | 8:10 AM London, Hammersmith Broadway (Irish Cultural Centre) | 0 changesdirect | |
FlixBus | 5:00 AM Cardiff, North Road (Friary Gardens) | 3h40 | 8:40 AM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 5:15 AM Cardiff, Sophia Gardens | 4h05 | 9:20 AM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 5:15 AM Cardiff, Sophia Gardens | 3h40 | 8:55 AM London, Earl's Court | 0 changesdirect | |
NX509 | 5:20 AM Cardiff, University | 4h00 | 9:20 AM London, Victoria Coach Station | 0 changesdirect | |
NX201 · NX032 | 5:25 AM Cardiff, Sophia Gardens | 5h00 | 10:25 AM London, Earl's Court | 1 change | |
NX507 | 6:00 AM Cardiff, Sophia Gardens | 4h05 | 10:05 AM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 6:05 AM Cardiff, North Road (Friary Gardens) | 4h00 | 10:05 AM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 6:05 AM Cardiff, North Road (Friary Gardens) | 3h30 | 9:35 AM London, Hammersmith Broadway (Irish Cultural Centre) | 0 changesdirect | |
NX507 | 6:05 AM Cardiff, University | 4h00 | 10:05 AM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 6:45 AM Cardiff, Sophia Gardens | 4h05 | 10:50 AM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 6:45 AM Cardiff, Sophia Gardens | 3h45 | 10:30 AM London, Earl's Court | 0 changesdirect | |
NX509 | 6:50 AM Cardiff, University | 4h00 | 10:50 AM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 7:10 AM Cardiff, North Road (Friary Gardens) | 3h20 | 10:30 AM London, Hammersmith Broadway (Irish Cultural Centre) | 0 changesdirect | |
FlixBus | 7:10 AM Cardiff, North Road (Friary Gardens) | 3h50 | 11:00 AM London, Victoria Coach Station | 0 changesdirect | |
NX507 | 7:30 AM Cardiff, Sophia Gardens | 3h55 | 11:25 AM London, Victoria Coach Station | 0 changesdirect | |
NX507 | 7:30 AM Cardiff, Sophia Gardens | 3h35 | 11:05 AM London, Earl's Court | 0 changesdirect | |
NX507 | 7:38 AM Cardiff, University | 3h47 | 11:25 AM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 8:30 AM Cardiff, Sophia Gardens | 3h50 | 12:20 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 8:30 AM Cardiff, Sophia Gardens | 3h30 | 12:00 PM London, Earl's Court | 0 changesdirect | |
NX509 | 8:38 AM Cardiff, University | 3h42 | 12:20 PM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 8:55 AM Cardiff, North Road (Friary Gardens) | 4h30 | 1:25 PM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 8:55 AM Cardiff, North Road (Friary Gardens) | 3h55 | 12:50 PM London, Hammersmith Broadway (Irish Cultural Centre) | 0 changesdirect | |
NX507 | 9:15 AM Cardiff, Sophia Gardens | 3h50 | 1:05 PM London, Victoria Coach Station | 0 changesdirect | |
NX507 | 9:15 AM Cardiff, Sophia Gardens | 3h30 | 12:45 PM London, Earl's Court | 0 changesdirect | |
NX507 | 9:23 AM Cardiff, University | 3h42 | 1:05 PM London, Victoria Coach Station | 0 changesdirect | |
NX201 · NX030 | 9:25 AM Cardiff, Sophia Gardens | 4h00 | 1:25 PM London, Earl's Court | 1 change | |
NX201 · NX032 | 9:25 AM Cardiff, Sophia Gardens | 4h00 | 1:25 PM London, Earl's Court | 1 change | |
NX509 | 10:00 AM Cardiff, Sophia Gardens | 3h50 | 1:50 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 10:00 AM Cardiff, Sophia Gardens | 3h30 | 1:30 PM London, Earl's Court | 0 changesdirect | |
NX509 | 10:08 AM Cardiff, University | 3h42 | 1:50 PM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 10:30 AM Cardiff, North Road (Friary Gardens) | 3h50 | 2:20 PM London, Hammersmith Broadway (Irish Cultural Centre) | 0 changesdirect | |
FlixBus | 10:30 AM Cardiff, North Road (Friary Gardens) | 4h20 | 2:50 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 11:30 AM Cardiff, Sophia Gardens | 3h35 | 3:05 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 11:30 AM Cardiff, Sophia Gardens | 3h15 | 2:45 PM London, Earl's Court | 0 changesdirect | |
NX509 | 11:38 AM Cardiff, University | 3h27 | 3:05 PM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 11:55 AM Cardiff, North Road (Friary Gardens) | 4h35 | 4:30 PM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 11:55 AM Cardiff, North Road (Friary Gardens) | 4h00 | 3:55 PM London, Hammersmith Broadway (Irish Cultural Centre) | 0 changesdirect | |
NX202 · NX032 | 12:35 PM Cardiff, Sophia Gardens | 4h45 | 5:20 PM London, Earl's Court | 1 change | |
FlixBus | 1:05 PM Cardiff, North Road (Friary Gardens) | 3h50 | 4:55 PM London, Hammersmith Broadway (Irish Cultural Centre) | 0 changesdirect | |
FlixBus | 1:05 PM Cardiff, North Road (Friary Gardens) | 4h25 | 5:30 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 1:45 PM Cardiff, Sophia Gardens | 4h05 | 5:50 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 1:45 PM Cardiff, Sophia Gardens | 3h45 | 5:30 PM London, Earl's Court | 0 changesdirect | |
NX509 | 1:53 PM Cardiff, University | 3h57 | 5:50 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 2:45 PM Cardiff, Sophia Gardens | 4h15 | 7:00 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 2:45 PM Cardiff, Sophia Gardens | 3h55 | 6:40 PM London, Earl's Court | 0 changesdirect | |
NX507 | 3:45 PM Cardiff, Sophia Gardens | 4h15 | 8:00 PM London, Victoria Coach Station | 0 changesdirect | |
NX507 | 3:45 PM Cardiff, Sophia Gardens | 3h55 | 7:40 PM London, Earl's Court | 0 changesdirect | |
NX507 | 3:55 PM Cardiff, University | 4h05 | 8:00 PM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 4:15 PM Cardiff, North Road (Friary Gardens) | 3h50 | 8:05 PM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 4:15 PM Cardiff, North Road (Friary Gardens) | 3h20 | 7:35 PM London, Hammersmith Broadway (Irish Cultural Centre) | 0 changesdirect | |
NX509 | 4:45 PM Cardiff, Sophia Gardens | 4h05 | 8:50 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 4:45 PM Cardiff, Sophia Gardens | 3h45 | 8:30 PM London, Earl's Court | 0 changesdirect | |
NX509 | 4:55 PM Cardiff, University | 3h55 | 8:50 PM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 5:25 PM Cardiff, North Road (Friary Gardens) | 3h20 | 8:45 PM London, Hammersmith Broadway (Irish Cultural Centre) | 0 changesdirect | |
FlixBus | 5:25 PM Cardiff, North Road (Friary Gardens) | 3h45 | 9:10 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 5:30 PM Cardiff, Sophia Gardens | 3h50 | 9:20 PM London, Victoria Coach Station | 0 changesdirect | |
NX509 | 5:30 PM Cardiff, Sophia Gardens | 3h30 | 9:00 PM London, Earl's Court | 0 changesdirect | |
NX509 | 5:40 PM Cardiff, University | 3h40 | 9:20 PM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 6:10 PM Cardiff, North Road (Friary Gardens) | 4h05 | 10:15 PM London, Victoria Coach Station | 0 changesdirect | |
FlixBus | 6:10 PM Cardiff, North Road (Friary Gardens) | 3h45 | 9:55 PM London, Hammersmith Broadway (Irish Cultural Centre) | 0 changesdirect | |
FlixBus | 6:40 PM Cardiff, North Road (Friary Gardens) | 4h00 | 10:40 PM London, Victoria Coach Station | 0 changesdirect | |
NX507 | 6:45 PM Cardiff, Sophia Gardens | 3h35 | 10:20 PM London, Victoria Coach Station | 0 changesdirect | |
NX507 | 6:45 PM Cardiff, Sophia Gardens | 3h15 | 10:00 PM London, Earl's Court | 0 changesdirect | |
NX507 | 6:53 PM Cardiff, University | 3h27 | 10:20 PM London, Victoria Coach Station | 0 changesdirect | |
Find all the dates and times for this journey
Compare prices and tickets Cardiff to London by train or coach
Compare train and coach prices over the next three weeks. See the best deals at a glance, find the lowest fares, and choose the option that fits your budget.
14 Aug
15 Aug
16 Aug
17 Aug
18 Aug
19 Aug
20 Aug
21 Aug
22 Aug
23 Aug
24 Aug
25 Aug
26 Aug
27 Aug
28 Aug
29 Aug
30 Aug
31 Aug
01 Sept
02 Sept
03 Sept
Why should you book Cardiff to London coaches with Omio?
Why book with Omio vs National Express?
- Compare with other providers: On Omio, you can not only buy tickets for National Express, but also compare tickets for the likes of Megabus or FlixBus to find the best option for your trip from Cardiff to London.
- Designed for International Travelers: Omio is in your language including 24/7 customer service and offers multiple payment options, including PayPal, credit cards, and bank transfer, in your preferred currency.
- Compare all your options: Omio allows you to compare National Express with all available travel options, which are train and bus to ensure you get the best deal for traveling from Cardiff to London.
Why book with Omio over Wanderu or Trainline?
- Compare with other providers: On Omio, you can also compare tickets for the likes of Megabus or FlixBus to find the best option for your trip from Cardiff to London.
- Multiple modes of transport: Omio allows you to compare travel options including train and bus to find the ideal travel option from Cardiff to London.
Journey information
Overview: Bus from Cardiff to London
Buses from Cardiff to London run on average 37 times per day, taking around 3h 23m. Cheap bus tickets for this journey start at 9S$ if you book in advance.
There are 32 coaches per day. The earliest coach runs at 00:10, the last at 23:45. The fastest coach covers the 211 km distance in 3h 10m.
Distance 211 km |
Average bus duration 3h 23m |
Cheapest ticket price 9S$ |
Buses per day 37 |
Direct buses 32 |
Fastest bus 3h 10m |
First bus 12:10 AM |
Last bus 11:45 PM |
Cheapest Month Jul |
Cheapest Day Sat |
High Season Oct - Dec |
Low Season Apr - Jun |
Busiest Day Mon |
Least Busy Day Sun |
Best time to book 21 days |
Bus providers: National Express, Megabus, FlixBus from Cardiff to LondonYou can travel by bus between Cardiff to London with National Express, Megabus, FlixBus for as low as 9S$. When you search for schedules and tickets, Omio will show you the best journey
FlixBus
National Express
Megabus
FAQs: Cardiff to London coach
Find answers to the most common questions about traveling from Cardiff to London by coach. From journey times and ticket prices to direct connections, first and last departures, and even whether the route is scenic, our FAQs cover everything you need to plan your trip. Whether you’re looking for the fastest coach, the cheapest option, or tips for making the most of your visit at London, this guide helps you travel smarter and with confidence.

- National Express
- Assistance
- Priority seating
- Accessible toilets.
- FlixBus
- Assistance
- Priority boarding
- Wheelchair-accessible buses.
- National Express
- You can cancel your ticket up to 24 hours before departure for a refund minus a cancellation fee. Changes can be up to 24 hours before departure for a fee.
- FlixBus
- You can cancel your ticket up to 15 minutes before departure and receive a voucher for future travel. Refund requests for delays over 120 minutes are possible.
- National Express
- Two medium-sized suitcases up to 20kg each and one small piece of hand luggage.
- FlixBus
- One carry-on bag up to 7kg (42x30x18 cm) and one checked bag up to 20kg (80x50x30 cm).
- National Express
- 10€ per additional bag.
- FlixBus
- Additional luggage can be purchased for a fee.
- FlixBus
- Small pets in carriers allowed
- guide dogs travel for free.
popular bus stations
Important Stations and Airports in Cardiff and London
Most Cardiff to London buses use the Cardiff, Sophia Gardens to London, Victoria Coach Station station pair, with some services arriving at London, Hammersmith Broadway (Irish Cultural Centre). Use this guide to compare Cardiff and London bus stations on this route, check city-centre transport, alongside checking practicalities like bus station facilities and services.
Which Cardiff station do buses to London leave from?
Getting to Cardiff, Sophia Gardens from Cardiff city centre
Cardiff, Sophia Gardens bus station facilities and services
Cardiff, Sophia Gardens has practical services for this route, including Wifi, Parking, ATM, Taxis, Accessibility, WC, Shower and Ticket Office.
Wi-Fi and ATMs
Wi-Fi is available at Cardiff, Sophia Gardens. ATMs are available at Cardiff, Sophia Gardens.
Tickets and information
Ticket office support is available at Cardiff, Sophia Gardens.
Parking, taxis and toilets
Available at Cardiff, Sophia Gardens: Parking, Taxis, WC.
Accessibility
Accessibility facilities are available at Cardiff, Sophia Gardens: Basic accessibility features available.
Getting to Cardiff, North Road (Friary Gardens) from Cardiff city centre
Cardiff, North Road (Friary Gardens) bus station facilities and services
Cardiff, North Road (Friary Gardens) has practical services for this route, including Wifi, Parking, ATM, Taxis, Accessibility, WC, Shower and Ticket Office.
Wi-Fi and ATMs
Wi-Fi is available at Cardiff, North Road (Friary Gardens). ATMs are available at Cardiff, North Road (Friary Gardens).
Tickets and information
Ticket office support is available at Cardiff, North Road (Friary Gardens).
Parking, taxis and toilets
Available at Cardiff, North Road (Friary Gardens): Parking, Taxis, WC.
Accessibility
Accessibility facilities are available at Cardiff, North Road (Friary Gardens): Accessible for passengers with reduced mobility.
Getting to Cardiff, University from Cardiff city centre
Which London station do buses from Cardiff arrive at?
Getting to London, Victoria Coach Station from London city centre
London, Victoria Coach Station is 2 km from London city centre. Public transport options include:
London, Victoria Coach Station bus station facilities and services
London, Victoria Coach Station has practical services for this route, including Wifi, Parking, Dining, ATM, Taxis, Accessibility, WC and Ticket Office.
Food and drink
Food options include: Pret a Manger (in the station), Starbucks (in the station).
Wi-Fi and ATMs
Free Wi-Fi. ATMs are located near the main entrance and inside the station.
Tickets and information
Ticket office support is available at London, Victoria Coach Station.
Parking, taxis and toilets
Available at London, Victoria Coach Station: Parking, Taxis, WC.
Accessibility
Accessibility facilities are available at London, Victoria Coach Station: Elevators, ramps.
Getting to London, Heathrow Airport Terminals 2 & 3 from London city centre
London, Heathrow Airport Terminals 2 & 3 bus station facilities and services
London, Heathrow Airport Terminals 2 & 3 has practical services for this route, including Wifi, Parking, Dining, ATM, Taxis, Accessibility, WC and Ticket Office.
Food and drink
Food options include: Pret a Manger (in the station), Caffè Nero (in the station)
Wi-Fi and ATMs
Free Wi-Fi. ATMs are located in the arrivals and departures areas, offering multiple currency options.
Tickets and information
Ticket office support is available at London, Heathrow Airport Terminals 2 & 3.
Parking, taxis and toilets
Available at London, Heathrow Airport Terminals 2 & 3: Parking, Taxis, WC.
Accessibility
Accessibility facilities are available at London, Heathrow Airport Terminals 2 & 3: Ramps, assistance.
Getting to London, Heathrow Airport Terminal 5 from London city centre
London, Heathrow Airport Terminal 5 is 2 km from London city centre. Public transport options include:
London, Heathrow Airport Terminal 5 bus station facilities and services
London, Heathrow Airport Terminal 5 has practical services for this route, including Wifi, Parking, Dining, ATM, Taxis, Accessibility, WC and Ticket Office.
Food and drink
Food options include: The Crown Rivers (in the station), Giraffe (in the station), Wagamama (in the station).
Wi-Fi and ATMs
Free Wi-Fi. ATMs are located near the arrivals and departures areas.
Tickets and information
Ticket office support is available at London, Heathrow Airport Terminal 5.
Parking, taxis and toilets
Available at London, Heathrow Airport Terminal 5: Parking, Taxis, WC.
Accessibility
Accessibility facilities are available at London, Heathrow Airport Terminal 5: Elevators, ramps.
More options for your journey from Cardiff to London
Here are some other resources that might have the information you need

